Chup is the watery substance in the ketchup bottle usually it comes from not shaking the ketchup bottle enough or at all the word originated from the 4 last letters of ketchup
Aiden:yeah sure man it’s should already be shaken
Aiden: *hands Ryan ketchup*
Ryan: *pours ketchup but only chup came out
Aiden: Jesus,bruh that’s a lot of chup
Ryan: yeah